/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.launcher3;

import android.appwidget.AppWidgetHostView;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;

/**
 * {@inheritDoc}
 */
public class LauncherAppWidgetHostView extends AppWidgetHostView {
	private boolean mHasPerformedLongPress;

	private CheckForLongPress mPendingCheckForLongPress;

	private LayoutInflater mInflater;

	public LauncherAppWidgetHostView(Context context) {
		super(context);
		mInflater = (LayoutInflater) context
				.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	}

	@Override
	protected View getErrorView() {
		return mInflater.inflate(R.layout.appwidget_error, this, false);
	}

	public boolean onInterceptTouchEvent(MotionEvent ev) {
		// Consume any touch events for ourselves after longpress is triggered
		if (mHasPerformedLongPress) {
			mHasPerformedLongPress = false;
			return true;
		}

		// Watch for longpress events at this level to make sure
		// users can always pick up this widget
		switch (ev.getAction()) {
		case MotionEvent.ACTION_DOWN: {
			postCheckForLongClick();
			break;
		}

		case MotionEvent.ACTION_UP:
		case MotionEvent.ACTION_CANCEL:
			mHasPerformedLongPress = false;
			if (mPendingCheckForLongPress != null) {
				removeCallbacks(mPendingCheckForLongPress);
			}
			break;
		}

		// Otherwise continue letting touch events fall through to children
		return false;
	}

	class CheckForLongPress implements Runnable {
		private int mOriginalWindowAttachCount;

		public void run() {
			if ((mParent != null) && hasWindowFocus()
					&& mOriginalWindowAttachCount == getWindowAttachCount()
					&& !mHasPerformedLongPress) {
				if (performLongClick()) {
					mHasPerformedLongPress = true;
				}
			}
		}

		public void rememberWindowAttachCount() {
			mOriginalWindowAttachCount = getWindowAttachCount();
		}
	}

	private void postCheckForLongClick() {
		mHasPerformedLongPress = false;

		if (mPendingCheckForLongPress == null) {
			mPendingCheckForLongPress = new CheckForLongPress();
		}
		mPendingCheckForLongPress.rememberWindowAttachCount();
		postDelayed(mPendingCheckForLongPress,
				ViewConfiguration.getLongPressTimeout());
	}

	@Override
	public void cancelLongPress() {
		super.cancelLongPress();

		mHasPerformedLongPress = false;
		if (mPendingCheckForLongPress != null) {
			removeCallbacks(mPendingCheckForLongPress);
		}
	}
}
